/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_init4_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:33:49,838 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:33:49,841 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:33:49,885 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:33:49,885 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:33:49,887 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:33:49,889 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:33:49,891 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:33:49,893 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:33:49,894 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:33:49,895 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:33:49,897 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-21 21:33:49,897 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-21 21:33:49,899 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-21 21:33:49,900 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-21 21:33:49,901 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-21 21:33:49,902 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-21 21:33:49,903 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-21 21:33:49,905 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-21 21:33:49,907 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-21 21:33:49,909 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-21 21:33:49,911 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-21 21:33:49,912 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-21 21:33:49,913 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-21 21:33:49,916 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-21 21:33:49,926 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:33:49,928 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:33:49,930 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:33:49,932 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:33:49,980 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:33:49,981 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:33:49,985 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:33:49,985 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:33:49,986 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:33:49,986 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:33:49,987 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:33:49,987 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:33:49,987 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:33:49,987 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:33:49,988 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:33:49,988 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:33:49,989 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:33:49,989 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:33:49,989 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:33:49,989 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:33:49,990 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:33:49,990 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:33:49,990 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:33:49,990 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:33:49,990 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:33:49,991 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:33:49,991 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:33:49,991 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:33:49,991 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:33:49,991 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:33:50,443 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:33:50,473 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:33:50,476 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:33:50,477 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:33:50,478 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:33:50,479 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_init4_ground-2.i [2020-12-21 21:33:50,573 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/35ab35ad2/4fd353a6bd864f34a89b878da393fc43/FLAG064eee9f7 [2020-12-21 21:33:51,132 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:33:51,133 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init4_ground-2.i [2020-12-21 21:33:51,142 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/35ab35ad2/4fd353a6bd864f34a89b878da393fc43/FLAG064eee9f7 [2020-12-21 21:33:51,489 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/35ab35ad2/4fd353a6bd864f34a89b878da393fc43 [2020-12-21 21:33:51,495 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:33:51,500 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:33:51,502 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:33:51,502 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:33:51,506 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:33:51,507 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,509 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ce36a19 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51, skipping insertion in model container [2020-12-21 21:33:51,510 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,522 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:33:51,543 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:33:51,743 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init4_ground-2.i[816,829] [2020-12-21 21:33:51,765 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:33:51,773 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:33:51,788 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init4_ground-2.i[816,829] [2020-12-21 21:33:51,796 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:33:51,813 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:33:51,814 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51 WrapperNode [2020-12-21 21:33:51,814 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:33:51,815 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:33:51,816 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:33:51,816 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:33:51,824 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,832 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,853 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:33:51,854 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:33:51,854 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:33:51,855 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:33:51,865 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,865 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,867 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,868 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,873 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,878 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,880 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... [2020-12-21 21:33:51,882 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:33:51,883 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:33:51,883 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:33:51,883 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:33:51,884 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:33:51,989 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:33:51,989 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:33:51,990 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:33:51,990 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:33:51,990 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:33:51,990 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:33:51,991 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:33:52,290 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:33:52,290 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-21 21:33:52,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:33:52 BoogieIcfgContainer [2020-12-21 21:33:52,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:33:52,295 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:33:52,295 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:33:52,299 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:33:52,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:33:51" (1/3) ... [2020-12-21 21:33:52,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ed4623e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:33:52, skipping insertion in model container [2020-12-21 21:33:52,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:33:51" (2/3) ... [2020-12-21 21:33:52,301 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ed4623e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:33:52, skipping insertion in model container [2020-12-21 21:33:52,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:33:52" (3/3) ... [2020-12-21 21:33:52,303 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_init4_ground-2.i [2020-12-21 21:33:52,311 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:33:52,316 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:33:52,337 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:33:52,377 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:33:52,378 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:33:52,378 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:33:52,378 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:33:52,378 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:33:52,378 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:33:52,378 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:33:52,379 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:33:52,410 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-12-21 21:33:52,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-21 21:33:52,416 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:52,417 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:52,418 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:52,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:52,426 INFO L82 PathProgramCache]: Analyzing trace with hash 474620133, now seen corresponding path program 1 times [2020-12-21 21:33:52,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:52,438 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349556226] [2020-12-21 21:33:52,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:52,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:52,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:33:52,690 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349556226] [2020-12-21 21:33:52,691 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:33:52,692 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:33:52,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364539193] [2020-12-21 21:33:52,698 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:33:52,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:52,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:33:52,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:33:52,717 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2020-12-21 21:33:52,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:52,768 INFO L93 Difference]: Finished difference Result 41 states and 67 transitions. [2020-12-21 21:33:52,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:33:52,770 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-12-21 21:33:52,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:52,779 INFO L225 Difference]: With dead ends: 41 [2020-12-21 21:33:52,779 INFO L226 Difference]: Without dead ends: 20 [2020-12-21 21:33:52,782 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:33:52,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-21 21:33:52,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-21 21:33:52,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-21 21:33:52,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-12-21 21:33:52,816 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 13 [2020-12-21 21:33:52,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:52,817 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-12-21 21:33:52,817 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:33:52,817 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-12-21 21:33:52,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:33:52,818 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:52,818 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:52,818 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:33:52,819 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:52,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:52,820 INFO L82 PathProgramCache]: Analyzing trace with hash -40844573, now seen corresponding path program 1 times [2020-12-21 21:33:52,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:52,820 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469022800] [2020-12-21 21:33:52,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:52,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:52,866 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:33:52,867 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469022800] [2020-12-21 21:33:52,867 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219166689] [2020-12-21 21:33:52,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:52,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:52,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:33:52,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:53,008 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:33:53,009 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:53,009 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:33:53,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494304286] [2020-12-21 21:33:53,011 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:33:53,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:53,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:33:53,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:33:53,013 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 5 states. [2020-12-21 21:33:53,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:53,072 INFO L93 Difference]: Finished difference Result 40 states and 51 transitions. [2020-12-21 21:33:53,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:33:53,072 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-12-21 21:33:53,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:53,073 INFO L225 Difference]: With dead ends: 40 [2020-12-21 21:33:53,073 INFO L226 Difference]: Without dead ends: 24 [2020-12-21 21:33:53,075 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:33:53,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-21 21:33:53,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-12-21 21:33:53,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:33:53,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-12-21 21:33:53,081 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 17 [2020-12-21 21:33:53,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:53,081 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-12-21 21:33:53,081 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:33:53,081 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-12-21 21:33:53,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:33:53,082 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:53,082 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:53,295 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:33:53,296 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:53,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:53,299 INFO L82 PathProgramCache]: Analyzing trace with hash 84997541, now seen corresponding path program 2 times [2020-12-21 21:33:53,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:53,299 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785057168] [2020-12-21 21:33:53,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:53,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:53,404 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-21 21:33:53,405 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785057168] [2020-12-21 21:33:53,405 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153559488] [2020-12-21 21:33:53,405 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:53,457 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:33:53,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:33:53,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:33:53,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:53,494 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-21 21:33:53,495 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:53,495 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:33:53,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983509021] [2020-12-21 21:33:53,496 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:33:53,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:53,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:33:53,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:33:53,498 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 6 states. [2020-12-21 21:33:53,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:53,548 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2020-12-21 21:33:53,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:33:53,549 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-12-21 21:33:53,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:53,549 INFO L225 Difference]: With dead ends: 47 [2020-12-21 21:33:53,550 INFO L226 Difference]: Without dead ends: 28 [2020-12-21 21:33:53,550 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:33:53,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-21 21:33:53,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-12-21 21:33:53,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 21:33:53,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-12-21 21:33:53,557 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 21 [2020-12-21 21:33:53,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:53,557 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-12-21 21:33:53,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:33:53,558 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-12-21 21:33:53,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 21:33:53,558 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:53,559 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:53,772 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:53,776 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:53,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:53,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1963806883, now seen corresponding path program 3 times [2020-12-21 21:33:53,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:53,779 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734276705] [2020-12-21 21:33:53,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:53,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:53,863 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-21 21:33:53,863 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734276705] [2020-12-21 21:33:53,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843953215] [2020-12-21 21:33:53,864 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:53,930 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:33:53,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:33:53,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:33:53,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:53,978 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-21 21:33:53,978 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:53,979 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:33:53,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248255485] [2020-12-21 21:33:53,980 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:33:53,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:53,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:33:53,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:33:53,981 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 7 states. [2020-12-21 21:33:54,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:54,032 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2020-12-21 21:33:54,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:33:54,033 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-12-21 21:33:54,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:54,034 INFO L225 Difference]: With dead ends: 54 [2020-12-21 21:33:54,034 INFO L226 Difference]: Without dead ends: 32 [2020-12-21 21:33:54,034 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:33:54,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-21 21:33:54,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-12-21 21:33:54,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-21 21:33:54,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-12-21 21:33:54,041 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 25 [2020-12-21 21:33:54,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:54,041 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-12-21 21:33:54,041 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:33:54,041 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-12-21 21:33:54,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-21 21:33:54,042 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:54,042 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:54,257 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:54,258 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:54,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:54,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1096399461, now seen corresponding path program 4 times [2020-12-21 21:33:54,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:54,261 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459256269] [2020-12-21 21:33:54,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:54,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:54,402 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-12-21 21:33:54,402 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459256269] [2020-12-21 21:33:54,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515652067] [2020-12-21 21:33:54,403 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:54,470 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:33:54,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:33:54,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:33:54,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:54,519 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-12-21 21:33:54,520 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:54,520 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:33:54,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466983629] [2020-12-21 21:33:54,521 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:33:54,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:54,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:33:54,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:33:54,523 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 8 states. [2020-12-21 21:33:54,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:54,580 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2020-12-21 21:33:54,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:33:54,580 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-12-21 21:33:54,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:54,581 INFO L225 Difference]: With dead ends: 61 [2020-12-21 21:33:54,581 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 21:33:54,582 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:33:54,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 21:33:54,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-12-21 21:33:54,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-21 21:33:54,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-12-21 21:33:54,589 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2020-12-21 21:33:54,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:54,590 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-12-21 21:33:54,590 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:33:54,590 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-12-21 21:33:54,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-21 21:33:54,591 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:54,591 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:54,806 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:54,808 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:54,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:54,809 INFO L82 PathProgramCache]: Analyzing trace with hash -910872989, now seen corresponding path program 5 times [2020-12-21 21:33:54,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:54,810 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121683492] [2020-12-21 21:33:54,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:54,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:54,927 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:33:54,928 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121683492] [2020-12-21 21:33:54,928 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060242849] [2020-12-21 21:33:54,929 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:55,278 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-21 21:33:55,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:33:55,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:33:55,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:55,350 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:33:55,350 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:55,351 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 21:33:55,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053721319] [2020-12-21 21:33:55,352 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:33:55,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:55,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:33:55,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:33:55,355 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 9 states. [2020-12-21 21:33:55,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:55,433 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2020-12-21 21:33:55,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 21:33:55,434 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 33 [2020-12-21 21:33:55,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:55,435 INFO L225 Difference]: With dead ends: 68 [2020-12-21 21:33:55,435 INFO L226 Difference]: Without dead ends: 40 [2020-12-21 21:33:55,439 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:33:55,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-21 21:33:55,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-12-21 21:33:55,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-21 21:33:55,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2020-12-21 21:33:55,455 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 33 [2020-12-21 21:33:55,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:55,455 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2020-12-21 21:33:55,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:33:55,455 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2020-12-21 21:33:55,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-21 21:33:55,458 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:55,459 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:55,660 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:33:55,661 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:55,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:55,662 INFO L82 PathProgramCache]: Analyzing trace with hash 937193253, now seen corresponding path program 6 times [2020-12-21 21:33:55,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:55,663 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593439450] [2020-12-21 21:33:55,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:55,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:55,752 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2020-12-21 21:33:55,753 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593439450] [2020-12-21 21:33:55,753 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598828511] [2020-12-21 21:33:55,753 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:56,054 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-21 21:33:56,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:33:56,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:33:56,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:56,142 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2020-12-21 21:33:56,143 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:56,144 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:33:56,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596265997] [2020-12-21 21:33:56,144 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:33:56,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:56,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:33:56,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:33:56,146 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 10 states. [2020-12-21 21:33:56,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:56,235 INFO L93 Difference]: Finished difference Result 75 states and 86 transitions. [2020-12-21 21:33:56,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:33:56,236 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-12-21 21:33:56,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:56,237 INFO L225 Difference]: With dead ends: 75 [2020-12-21 21:33:56,237 INFO L226 Difference]: Without dead ends: 44 [2020-12-21 21:33:56,238 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:33:56,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-21 21:33:56,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-12-21 21:33:56,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-21 21:33:56,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-12-21 21:33:56,244 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 37 [2020-12-21 21:33:56,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:56,244 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-12-21 21:33:56,244 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:33:56,244 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-12-21 21:33:56,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:33:56,245 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:56,245 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:56,460 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:56,461 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:56,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:56,462 INFO L82 PathProgramCache]: Analyzing trace with hash -80716765, now seen corresponding path program 7 times [2020-12-21 21:33:56,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:56,463 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580070065] [2020-12-21 21:33:56,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:56,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:56,562 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-12-21 21:33:56,562 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580070065] [2020-12-21 21:33:56,563 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193121214] [2020-12-21 21:33:56,563 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:56,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:56,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:33:56,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:56,725 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-12-21 21:33:56,726 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:56,726 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:33:56,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817008069] [2020-12-21 21:33:56,727 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:33:56,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:56,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:33:56,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:33:56,728 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-12-21 21:33:56,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:56,818 INFO L93 Difference]: Finished difference Result 82 states and 93 transitions. [2020-12-21 21:33:56,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:33:56,818 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-12-21 21:33:56,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:56,819 INFO L225 Difference]: With dead ends: 82 [2020-12-21 21:33:56,819 INFO L226 Difference]: Without dead ends: 48 [2020-12-21 21:33:56,820 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:33:56,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-21 21:33:56,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-12-21 21:33:56,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-21 21:33:56,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-12-21 21:33:56,826 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 41 [2020-12-21 21:33:56,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:56,826 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-12-21 21:33:56,826 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:33:56,826 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-12-21 21:33:56,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 21:33:56,827 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:56,828 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:57,040 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:57,041 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:57,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:57,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1336863771, now seen corresponding path program 8 times [2020-12-21 21:33:57,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:57,044 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263420546] [2020-12-21 21:33:57,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:57,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:57,199 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-12-21 21:33:57,200 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263420546] [2020-12-21 21:33:57,203 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485548099] [2020-12-21 21:33:57,203 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:57,269 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:33:57,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:33:57,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:33:57,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:57,358 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-12-21 21:33:57,358 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:57,359 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:33:57,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093215858] [2020-12-21 21:33:57,359 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:33:57,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:57,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:33:57,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:33:57,361 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 12 states. [2020-12-21 21:33:57,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:57,450 INFO L93 Difference]: Finished difference Result 89 states and 100 transitions. [2020-12-21 21:33:57,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:33:57,451 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2020-12-21 21:33:57,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:57,451 INFO L225 Difference]: With dead ends: 89 [2020-12-21 21:33:57,451 INFO L226 Difference]: Without dead ends: 52 [2020-12-21 21:33:57,452 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:33:57,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-21 21:33:57,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-12-21 21:33:57,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:33:57,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2020-12-21 21:33:57,458 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 45 [2020-12-21 21:33:57,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:57,459 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2020-12-21 21:33:57,459 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:33:57,459 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2020-12-21 21:33:57,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:33:57,460 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:57,460 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:57,673 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:33:57,674 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:57,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:57,675 INFO L82 PathProgramCache]: Analyzing trace with hash -131671581, now seen corresponding path program 9 times [2020-12-21 21:33:57,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:57,676 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545375231] [2020-12-21 21:33:57,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:57,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:57,820 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-12-21 21:33:57,820 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545375231] [2020-12-21 21:33:57,821 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145019390] [2020-12-21 21:33:57,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:59,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-21 21:33:59,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:33:59,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:33:59,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:59,306 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-12-21 21:33:59,306 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:59,307 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 21:33:59,307 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945851859] [2020-12-21 21:33:59,307 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:33:59,307 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:59,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:33:59,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:33:59,309 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand 13 states. [2020-12-21 21:33:59,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:33:59,404 INFO L93 Difference]: Finished difference Result 96 states and 107 transitions. [2020-12-21 21:33:59,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:33:59,405 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 49 [2020-12-21 21:33:59,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:33:59,406 INFO L225 Difference]: With dead ends: 96 [2020-12-21 21:33:59,406 INFO L226 Difference]: Without dead ends: 56 [2020-12-21 21:33:59,407 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:33:59,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-21 21:33:59,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-12-21 21:33:59,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-21 21:33:59,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2020-12-21 21:33:59,413 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 49 [2020-12-21 21:33:59,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:33:59,414 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2020-12-21 21:33:59,414 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:33:59,414 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2020-12-21 21:33:59,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-21 21:33:59,415 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:33:59,415 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:33:59,629 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:59,631 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:33:59,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:33:59,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1399826597, now seen corresponding path program 10 times [2020-12-21 21:33:59,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:33:59,633 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542183362] [2020-12-21 21:33:59,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:33:59,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:33:59,779 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2020-12-21 21:33:59,779 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542183362] [2020-12-21 21:33:59,779 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802137775] [2020-12-21 21:33:59,780 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:33:59,861 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:33:59,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:33:59,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:33:59,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:33:59,944 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2020-12-21 21:33:59,944 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:33:59,944 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 21:33:59,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42743717] [2020-12-21 21:33:59,945 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:33:59,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:33:59,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:33:59,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:33:59,946 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 14 states. [2020-12-21 21:34:00,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:34:00,057 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2020-12-21 21:34:00,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:34:00,058 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2020-12-21 21:34:00,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:34:00,058 INFO L225 Difference]: With dead ends: 103 [2020-12-21 21:34:00,059 INFO L226 Difference]: Without dead ends: 60 [2020-12-21 21:34:00,059 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:34:00,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-21 21:34:00,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-12-21 21:34:00,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-21 21:34:00,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2020-12-21 21:34:00,066 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 53 [2020-12-21 21:34:00,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:34:00,066 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2020-12-21 21:34:00,067 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:34:00,067 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2020-12-21 21:34:00,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-21 21:34:00,068 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:34:00,068 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:34:00,282 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:34:00,283 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:34:00,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:34:00,284 INFO L82 PathProgramCache]: Analyzing trace with hash 507553699, now seen corresponding path program 11 times [2020-12-21 21:34:00,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:34:00,285 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967368517] [2020-12-21 21:34:00,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:34:00,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:34:00,436 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2020-12-21 21:34:00,437 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967368517] [2020-12-21 21:34:00,437 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579358978] [2020-12-21 21:34:00,437 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:34:38,364 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2020-12-21 21:34:38,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:34:38,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:34:38,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:34:38,487 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2020-12-21 21:34:38,487 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:34:38,487 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:34:38,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061723409] [2020-12-21 21:34:38,488 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:34:38,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:34:38,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:34:38,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:34:38,489 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 15 states. [2020-12-21 21:34:38,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:34:38,610 INFO L93 Difference]: Finished difference Result 110 states and 121 transitions. [2020-12-21 21:34:38,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:34:38,611 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 57 [2020-12-21 21:34:38,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:34:38,612 INFO L225 Difference]: With dead ends: 110 [2020-12-21 21:34:38,612 INFO L226 Difference]: Without dead ends: 64 [2020-12-21 21:34:38,613 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:34:38,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-21 21:34:38,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-12-21 21:34:38,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-21 21:34:38,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2020-12-21 21:34:38,620 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 57 [2020-12-21 21:34:38,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:34:38,620 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2020-12-21 21:34:38,621 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:34:38,621 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2020-12-21 21:34:38,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:34:38,622 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:34:38,622 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:34:38,836 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:34:38,837 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:34:38,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:34:38,838 INFO L82 PathProgramCache]: Analyzing trace with hash 720383333, now seen corresponding path program 12 times [2020-12-21 21:34:38,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:34:38,839 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016102071] [2020-12-21 21:34:38,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:34:38,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:34:39,020 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-12-21 21:34:39,021 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016102071] [2020-12-21 21:34:39,021 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861754113] [2020-12-21 21:34:39,021 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:34:50,119 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:34:50,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:34:50,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 21:34:50,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:34:50,219 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-12-21 21:34:50,219 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:34:50,220 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-21 21:34:50,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643683252] [2020-12-21 21:34:50,220 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:34:50,221 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:34:50,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:34:50,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:34:50,222 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand 16 states. [2020-12-21 21:34:50,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:34:50,351 INFO L93 Difference]: Finished difference Result 117 states and 128 transitions. [2020-12-21 21:34:50,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:34:50,352 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 61 [2020-12-21 21:34:50,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:34:50,353 INFO L225 Difference]: With dead ends: 117 [2020-12-21 21:34:50,353 INFO L226 Difference]: Without dead ends: 68 [2020-12-21 21:34:50,354 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:34:50,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-21 21:34:50,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-12-21 21:34:50,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-21 21:34:50,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2020-12-21 21:34:50,361 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 61 [2020-12-21 21:34:50,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:34:50,361 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2020-12-21 21:34:50,361 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:34:50,362 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2020-12-21 21:34:50,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-21 21:34:50,362 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:34:50,363 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:34:50,563 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:34:50,564 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:34:50,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:34:50,565 INFO L82 PathProgramCache]: Analyzing trace with hash -1171929757, now seen corresponding path program 13 times [2020-12-21 21:34:50,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:34:50,566 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585569329] [2020-12-21 21:34:50,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:34:50,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:34:50,742 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2020-12-21 21:34:50,742 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585569329] [2020-12-21 21:34:50,743 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471252001] [2020-12-21 21:34:50,743 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:34:50,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:34:50,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:34:50,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:34:50,943 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2020-12-21 21:34:50,944 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:34:50,944 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:34:50,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324773753] [2020-12-21 21:34:50,946 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:34:50,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:34:50,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:34:50,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:34:50,947 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand 17 states. [2020-12-21 21:34:51,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:34:51,065 INFO L93 Difference]: Finished difference Result 124 states and 135 transitions. [2020-12-21 21:34:51,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:34:51,066 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-12-21 21:34:51,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:34:51,067 INFO L225 Difference]: With dead ends: 124 [2020-12-21 21:34:51,067 INFO L226 Difference]: Without dead ends: 72 [2020-12-21 21:34:51,069 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:34:51,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-12-21 21:34:51,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-12-21 21:34:51,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-12-21 21:34:51,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2020-12-21 21:34:51,091 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 65 [2020-12-21 21:34:51,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:34:51,095 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2020-12-21 21:34:51,095 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:34:51,095 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2020-12-21 21:34:51,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-12-21 21:34:51,096 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:34:51,096 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:34:51,310 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:34:51,311 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:34:51,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:34:51,312 INFO L82 PathProgramCache]: Analyzing trace with hash 562733605, now seen corresponding path program 14 times [2020-12-21 21:34:51,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:34:51,313 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418679444] [2020-12-21 21:34:51,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:34:51,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:34:51,532 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2020-12-21 21:34:51,532 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418679444] [2020-12-21 21:34:51,532 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443256241] [2020-12-21 21:34:51,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:34:51,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:34:51,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:34:51,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:34:51,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:34:51,698 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2020-12-21 21:34:51,698 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:34:51,698 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:34:51,699 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078313542] [2020-12-21 21:34:51,699 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:34:51,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:34:51,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:34:51,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:34:51,700 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 18 states. [2020-12-21 21:34:51,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:34:51,830 INFO L93 Difference]: Finished difference Result 131 states and 142 transitions. [2020-12-21 21:34:51,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:34:51,830 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2020-12-21 21:34:51,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:34:51,831 INFO L225 Difference]: With dead ends: 131 [2020-12-21 21:34:51,831 INFO L226 Difference]: Without dead ends: 76 [2020-12-21 21:34:51,832 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:34:51,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-21 21:34:51,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-12-21 21:34:51,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-21 21:34:51,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2020-12-21 21:34:51,837 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 69 [2020-12-21 21:34:51,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:34:51,838 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2020-12-21 21:34:51,838 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:34:51,838 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2020-12-21 21:34:51,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-21 21:34:51,839 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:34:51,839 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:34:52,053 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:34:52,053 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:34:52,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:34:52,055 INFO L82 PathProgramCache]: Analyzing trace with hash -2021772509, now seen corresponding path program 15 times [2020-12-21 21:34:52,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:34:52,055 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497107351] [2020-12-21 21:34:52,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:34:52,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:34:52,305 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2020-12-21 21:34:52,305 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497107351] [2020-12-21 21:34:52,305 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1851923913] [2020-12-21 21:34:52,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:35:05,300 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-21 21:35:05,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:35:05,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 21:35:05,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:35:05,396 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2020-12-21 21:35:05,396 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:35:05,396 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 21:35:05,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723713688] [2020-12-21 21:35:05,397 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:35:05,397 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:35:05,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:35:05,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:35:05,398 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand 19 states. [2020-12-21 21:35:05,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:35:05,534 INFO L93 Difference]: Finished difference Result 138 states and 149 transitions. [2020-12-21 21:35:05,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:35:05,534 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 73 [2020-12-21 21:35:05,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:35:05,535 INFO L225 Difference]: With dead ends: 138 [2020-12-21 21:35:05,535 INFO L226 Difference]: Without dead ends: 80 [2020-12-21 21:35:05,536 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:35:05,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-21 21:35:05,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2020-12-21 21:35:05,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-12-21 21:35:05,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2020-12-21 21:35:05,541 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 73 [2020-12-21 21:35:05,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:35:05,541 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2020-12-21 21:35:05,541 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:35:05,542 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2020-12-21 21:35:05,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-12-21 21:35:05,542 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:35:05,542 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:35:05,756 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:35:05,756 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:35:05,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:35:05,757 INFO L82 PathProgramCache]: Analyzing trace with hash -2097740059, now seen corresponding path program 16 times [2020-12-21 21:35:05,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:35:05,758 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061212765] [2020-12-21 21:35:05,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:35:05,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:35:06,016 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2020-12-21 21:35:06,016 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061212765] [2020-12-21 21:35:06,016 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182729790] [2020-12-21 21:35:06,017 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:35:06,105 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:35:06,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:35:06,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:35:06,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:35:06,182 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2020-12-21 21:35:06,182 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:35:06,183 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 21:35:06,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010073270] [2020-12-21 21:35:06,183 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:35:06,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:35:06,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:35:06,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:35:06,184 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand 20 states. [2020-12-21 21:35:06,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:35:06,321 INFO L93 Difference]: Finished difference Result 145 states and 156 transitions. [2020-12-21 21:35:06,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:35:06,322 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 77 [2020-12-21 21:35:06,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:35:06,323 INFO L225 Difference]: With dead ends: 145 [2020-12-21 21:35:06,323 INFO L226 Difference]: Without dead ends: 84 [2020-12-21 21:35:06,324 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:35:06,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-12-21 21:35:06,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2020-12-21 21:35:06,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-12-21 21:35:06,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2020-12-21 21:35:06,328 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 77 [2020-12-21 21:35:06,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:35:06,329 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2020-12-21 21:35:06,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:35:06,329 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2020-12-21 21:35:06,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-12-21 21:35:06,330 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:35:06,330 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:35:06,543 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:35:06,544 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:35:06,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:35:06,545 INFO L82 PathProgramCache]: Analyzing trace with hash 821162211, now seen corresponding path program 17 times [2020-12-21 21:35:06,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:35:06,545 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831366923] [2020-12-21 21:35:06,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:35:06,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:35:06,782 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2020-12-21 21:35:06,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831366923] [2020-12-21 21:35:06,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600657141] [2020-12-21 21:35:06,783 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true